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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
commit | 218caa410aa38c29984be31a5229b9fa717560ee (patch) | |
tree | c54bd55eeb6e4c508940a30e94c0032fbd45d677 /tests/ui/drop/dropck-eyepatch-reorder.rs | |
parent | Releasing progress-linux version 1.67.1+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-218caa410aa38c29984be31a5229b9fa717560ee.tar.xz rustc-218caa410aa38c29984be31a5229b9fa717560ee.zip |
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/drop/dropck-eyepatch-reorder.rs')
-rw-r--r-- | tests/ui/drop/dropck-eyepatch-reorder.rs | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/tests/ui/drop/dropck-eyepatch-reorder.rs b/tests/ui/drop/dropck-eyepatch-reorder.rs new file mode 100644 index 000000000..0d7af3d4f --- /dev/null +++ b/tests/ui/drop/dropck-eyepatch-reorder.rs @@ -0,0 +1,79 @@ +// run-pass +#![feature(dropck_eyepatch)] + +// The point of this test is to test uses of `#[may_dangle]` attribute +// where the formal declaration order (in the impl generics) does not +// match the actual usage order (in the type instantiation). +// +// See also dropck-eyepatch.rs for more information about the general +// structure of the test. + +trait Foo { fn foo(&self, _: &str); } + +struct Dt<A: Foo>(&'static str, A); +struct Dr<'a, B:'a+Foo>(&'static str, &'a B); +struct Pt<A: Foo, B: Foo>(&'static str, #[allow(unused_tuple_struct_fields)] A, B); +struct Pr<'a, 'b, B:'a+'b+Foo>(&'static str, #[allow(unused_tuple_struct_fields)] &'a B, &'b B); +struct St<A: Foo>(&'static str, #[allow(unused_tuple_struct_fields)] A); +struct Sr<'a, B:'a+Foo>(&'static str, #[allow(unused_tuple_struct_fields)] &'a B); + +impl<A: Foo> Drop for Dt<A> { + fn drop(&mut self) { println!("drop {}", self.0); self.1.foo(self.0); } +} +impl<'a, B: Foo> Drop for Dr<'a, B> { + fn drop(&mut self) { println!("drop {}", self.0); self.1.foo(self.0); } +} +unsafe impl<B: Foo, #[may_dangle] A: Foo> Drop for Pt<A, B> { + // (unsafe to access self.1 due to #[may_dangle] on A) + fn drop(&mut self) { println!("drop {}", self.0); self.2.foo(self.0); } +} +unsafe impl<'b, #[may_dangle] 'a, B: Foo> Drop for Pr<'a, 'b, B> { + // (unsafe to access self.1 due to #[may_dangle] on 'a) + fn drop(&mut self) { println!("drop {}", self.0); self.2.foo(self.0); } +} + +fn main() { + use std::cell::RefCell; + + impl Foo for RefCell<String> { + fn foo(&self, s: &str) { + let s2 = format!("{}|{}", *self.borrow(), s); + *self.borrow_mut() = s2; + } + } + + impl<'a, T:Foo> Foo for &'a T { + fn foo(&self, s: &str) { + (*self).foo(s); + } + } + + struct CheckOnDrop(RefCell<String>, &'static str); + impl Drop for CheckOnDrop { + fn drop(&mut self) { assert_eq!(*self.0.borrow(), self.1); } + } + + let c_long; + let (c, dt, dr, pt, pr, st, sr) + : (CheckOnDrop, Dt<_>, Dr<_>, Pt<_, _>, Pr<_>, St<_>, Sr<_>); + c_long = CheckOnDrop(RefCell::new("c_long".to_string()), + "c_long|pr|pt|dr|dt"); + c = CheckOnDrop(RefCell::new("c".to_string()), + "c"); + + // No error: sufficiently long-lived state can be referenced in dtors + dt = Dt("dt", &c_long.0); + dr = Dr("dr", &c_long.0); + + // No error: Drop impl asserts .1 (A and &'a _) are not accessed + pt = Pt("pt", &c.0, &c_long.0); + pr = Pr("pr", &c.0, &c_long.0); + + // No error: St and Sr have no destructor. + st = St("st", &c.0); + sr = Sr("sr", &c.0); + + println!("{:?}", (dt.0, dr.0, pt.0, pr.0, st.0, sr.0)); + assert_eq!(*c_long.0.borrow(), "c_long"); + assert_eq!(*c.0.borrow(), "c"); +} |